<template>
  <el-container class="main_container">
    <!-- 头部布局 -->
    <el-header>
      <!-- Logo和项目名称 -->
      <div class="left_box">
        <img src="../assets/logo.png">
        <span>新冠物资管理系统</span>
      </div>
      <!-- 用户登录展示的头像 -->
      <div class="right_box">
        <el-dropdown>
          <img src="../assets/logo.png">
          <!-- 下拉菜单 -->
          <el-dropdown-menu slot="dropdown">
            <el-dropdown-item icon="el-icon-house">系统首页</el-dropdown-item>
            <el-dropdown-item icon="el-icon-ship">交流讨论</el-dropdown-item>
            <el-dropdown-item icon="el-icon-switch-button">退出登录</el-dropdown-item>
          </el-dropdown-menu>
        </el-dropdown>
      </div>
    </el-header>
    <el-container>
      <!-- 侧边栏 -->
      <el-aside :width="isCollapse?'60px':'200px'">
        <!-- 展开/收起 -->
        <div class="toggle_box" @click="toggleCollapse">|||</div>
        <el-menu
          default-active="2"
          class="el-menu-vertical-demo"
          @open="handleOpen"
          @close="handleClose"
          background-color="#001529"
          text-color="#fff"
          active-text-color="#ffd04b"
          :collapse="isCollapse"
          :collapse-transition="false"
          :unique-opened="true">
        </el-menu>
      </el-aside>
      <el-main>Main</el-main>
    </el-container>
  </el-container>
</template>

<script>
export default {
  name: 'Main',
  data() {
    return {
      isCollapse: false
    }
  },
  methods: {
    toggleCollapse() {
      this.isCollapse = !this.isCollapse
    }
  }
}
</script>


<style lang="less" scoped>
  /*设置整个容器的高度*/
  .main_container {
    height: 100%;
  }
  /*头部布局*/
  .el-header {
    background-color: #001529;
    display: flex;
    justify-content: space-between;
    padding-left: 0;
    color: #FFFFFF;
    align-items: center;
    text-align: center;
    line-height: 60px;
    font-size: 20px;
    /*坐标logo和标题*/
    .left_box {
      display: flex;
      align-items: center;

      /*Logo*/
      img {
        width: 60px;
        height: 60px;
        margin: 0px 0px 0px 10px;
      }

      /*标题*/
      span {
        margin-left: 15px;
      }
    }

    /*右边的登录头像*/
    .right_box {
      align-items: center;
      .el-dropdown > img {
        width: 50px;
        height: 50px;
        border-radius: 50%;
        background-color: #FFFFFF;
        margin: 22px 15px 0px 0px;
        background-size: contain;
      }
    }
  }

  /*侧边栏*/
  .el-aside {
    background-color: #001529;
    .el-menu {
      border-right: none;
    }
    /*展开/收起*/
    .toggle_box {
      background-color: chartreuse;
      font-weight: bold;
      line-height: 25px;
      color: #FFFFFF;
      letter-spacing: 0.2em;
      text-align: center;
      cursor: pointer;
    }
  }

  /*主体*/
  .el-main {
    background-color: #E9EEF3;
    color: #333;
    text-align: center;
    line-height: 160px;
  }

  /*下拉菜单样式*/
  .el-dropdown-link {
    cursor: pointer;
    color: #409EFF;
  }


</style>
